EP0380069A1 - Handkurbelelement und Widerlager für dasselbe - Google Patents

Handkurbelelement und Widerlager für dasselbe Download PDF

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Publication number
EP0380069A1
EP0380069A1 EP90101357A EP90101357A EP0380069A1 EP 0380069 A1 EP0380069 A1 EP 0380069A1 EP 90101357 A EP90101357 A EP 90101357A EP 90101357 A EP90101357 A EP 90101357A EP 0380069 A1 EP0380069 A1 EP 0380069A1
Authority
EP
European Patent Office
Prior art keywords
section
crank
abutment
coil spring
hand crank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90101357A
Other languages
German (de)
English (en)
French (fr)
Inventor
Manfred Streicher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MASTR TECHNISCHE PRODUKTE GmbH
Original Assignee
MASTR TECHNISCHE PRODUKTE GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MASTR TECHNISCHE PRODUKTE GmbH filed Critical MASTR TECHNISCHE PRODUKTE GmbH
Publication of EP0380069A1 publication Critical patent/EP0380069A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N1/00—Starting apparatus having hand cranks
    • F02N1/02—Starting apparatus having hand cranks having safety means preventing damage caused by reverse rotation

Definitions

  • the invention relates to a hand crank element as a more or less incomplete part of a hand crank for starting (starting) internal combustion engines.
  • a hand crank essentially consists of a crank tube, the front end region of which can be brought into engagement with the crankshaft of an internal combustion engine in order to be able to start the same.
  • a crank arm is generally attached to the crank tube and, in turn, a crank handle is attached to this.
  • the crank tube, crank arm and crank handle are mutually arranged in an approximately Z-shape and are connected to one another in a rotationally fixed manner. This crank tube is now part of the invention.
  • the invention also relates to an abutment adapted according to the invention for this hand crank element.
  • a hand crank serves as a starting device for internal combustion engines.
  • the torque required to start the internal combustion engine is applied via the hand crank by the arm force of a person required by turning the hand crank.
  • a hand crank In addition to the release device, a hand crank must also have a safety device against kickback.
  • a kickback occurs due to a sudden change in the direction of rotation of the hand crank, which is caused by compression or combustion pressure during the starting process. Such a sudden change in the direction of rotation of the hand crank can injure the person starting an engine with a hand crank on their hand. Every hand crank should therefore have a safety device against hand crank kickback.
  • a known safety crank In a known safety crank, its handle tube rotates in different directions when it is turned forwards and backwards. Depending on the respective direction of rotation, the connection between the starting claw and the starting crank is released or made in a form-fitting manner. The release or connection takes place by means of a gear wheel fixedly attached to the handle tube, with which a rod-shaped, spring-loaded part can be brought into or out of engagement.
  • the handlebar In order for this crank to work, the handlebar must be held strong enough. This firm grip must not be loosened during the starting process; otherwise the trigger mechanism between the rod-shaped member and the gearwheel would be activated, with the unpleasant consequence that the person starting off would fall through the space with your arm, as it were. This means that the operator must have a clear idea of the operating principle of this crank.
  • crank handle covers a "return path". This return path is always available due to its function. The greater this return movement of the hand crank, the more uncomfortable or the greater the risk of injury for an operator.
  • the invention has for its object to provide a hand crank and an abutment for the same, with which the disadvantages known from the prior art can be avoided and which is simple in construction and yet absolutely reliable.
  • the hand crank element according to the invention is accordingly characterized in that the crank tube consists of a first and a second section which are located one behind the other and separated from one another in the axial direction, that a coil spring surrounds the two sections at least in their abutting two end regions, that the one end region of the Coil spring ends on the first section and that the other end region of the coil spring is present at a greater distance than the other turns of the coil spring on the other section.
  • the invention also relates to an abutment with a circular cylindrical recess for this crank element.
  • This abutment is arranged rotatably with respect to the crankshaft of an internal combustion engine.
  • This abutment according to the invention is given by the features of claim 7.
  • the abutment is accordingly characterized in that the second section of the crank tube can be passed through the recess thereof, the other end region of the coil spring, which is at a greater distance from this section, can be placed on the abutment and guided there.
  • the required torque is transmitted from the crank arm to the crankshaft by the coil spring wrapping around the two sections when the crank tube or the hand crank is rotated accordingly.
  • the spread-apart coil spring end grinds along the inside of the recess.
  • the helical spring ends in a toothed disc which is arranged concentrically to it and rotatable on the second section, while at least one spring rod is attached to the abutment, which engages or meshes with the toothed disc.
  • crankshaft turns faster than the crank tube is rotated, which occurs after the engine has started, this has no unpleasant consequences for the operator, since the section connected to the crankshaft can rotate as quickly as desired within the coil spring windings.
  • the section still engaging on the crankshaft will turn around differently;
  • the helical spring end which is in frictional contact with the inside or of the toothed washer with one or preferably the two spring bars will expand during this counter-rotating movement of the crankshaft, as a result of which the windings of the helical spring will expand, so that there is no non-positive connection between the two Parts of the crank tube is more available.
  • Such a hand crank will practically not turn back when a setback occurs; the hand crank will still stand still.
  • the coil spring can have any cross section.
  • a circular or band-shaped or rectangular cross-section has proven to be favorable.
  • the section attached to the crank arm In order to fix the two sections of the crank tube in their mutual axial alignment, it has proven to be expedient to design the section attached to the crank arm to be tubular, so that it can surround the other, circular-cylindrical section in a section in a sleeve-like manner.
  • the inner surface of its recess it has proven to be advantageous to design the inner surface of its recess to be smooth or toothed.
  • the abutment must be non-rotatable with respect to the crankshaft.
  • the torsional strength can be achieved in that the abutment is attached or clamped to the internal combustion engine, or is supported in a torsion-proof manner on the ground, for example.
  • the abutment can also be held against rotation by the operator directly or via a cantilever attached to it. The latter could be done, for example, by a cantilever attached to the sleeve-shaped abutment so that Abutment stands away that the operator can step on the same with his foot and so hold the abutment against rotation when the engine is turned on.
  • crankshaft 12 protrudes from an engine block 10 shown symbolically in FIG. 1.
  • This crankshaft 12 is provided with opposite cutouts 14, 16.
  • the end of this crankshaft 12 is hollow-cylindrical, so that the crank tube 18 of a hand crank 20 can dip into the crankshaft 12.
  • pins 21, 22 projecting from the crank tube 18 engage in the cutouts 14, 16, so that the crank shaft 12 can also be set in a corresponding rotation by rotating the crank tube 18 about the axis 24.
  • the crank tube 18 can also end in the region of the pins 21, 22, so that the end of the crankshaft 12 then does not have a hollow cylindrical shape needs to be det.
  • crank arm 26 is attached to the crank tube 18 at right angles to the latter, and a crank handle 28 is in turn perpendicular to the latter.
  • crank handle 28 By pivoting the crank handle 28 around the axis 24 and thus by turning the hand crank 20, the crankshaft 12 can be set in rotation.
  • the hand crank 30 shown in FIGS. 2 and 3 also has, like the hand crank 20, a crank handle 32 which is attached at right angles to a crank arm 34.
  • a tube piece 36 is attached to the crank arm 34 in one piece.
  • a circular cylindrical part 40 is present in the extension of the longitudinal axis 38 of this pipe section 36.
  • the outside diameter of this part 40 corresponds to the outside diameter of the pipe section 36.
  • a further circular cylindrical part 44 protrudes from its end face 42 facing the crank arm 24, which extends through the pipe section 36.
  • this cylindrical part 44 is fastened to a disk 46 by means of a screw 48.
  • the disk 46 is rotatably mounted on an annular projection 50 of the crank arm 24 or the tube piece 36.
  • the circular cylindrical part 44 can thus be rotated within the pipe section 36 about its longitudinal axis 38, which is also the longitudinal axis of the pipe section 36.
  • a gap 52 is present between the end face 42 of the circular cylindrical part 40 and the end face of the free end of the pipe section 36 on the left in FIG. 3.
  • This gap 52 is bridged by a helical spring 54, the right end 56 of which ends in the immediate vicinity of a projection 58 present on the crank arm 24.
  • the left end 60 of the coil spring 54 has a larger turn diameter than the other turns 62 of this coil spring 54, so that it spreads against the inner surface 64 of a bushing 66 present there.
  • the inside diameter of bushing 66 is larger than the maximum outer diameter of the turns 62.
  • the inner surface 64 of the bushing 66 has a transverse ribbing 68.
  • Another circular cylindrical part 72 whose axis also coincides with the longitudinal axis 38, protrudes from the circular cylindrical part 40 on its end face 70 opposite the crank arm 34.
  • a ring 80 which has a larger diameter than the windings 62, so that it represents a left abutment for the coil spring 54.
  • an L-shaped cantilever 84 is fastened, the lower leg 88 of which is provided so that an operator can support his foot on this leg when turning the hand crank 30.
  • the hand crank works in the following way.
  • crank arm 34 and hand crank 30 will also rotate faster than the crank arm 34.
  • This faster rotational movement will result in the left end 60 of the coil spring 54 rotating in the direction of rotation 90 faster than the rest of the winding area of this coil spring, so that the frictional forces between the coil spring and the circular cylindrical part 40 are lost. Since this loss of the frictional connection will take place slowly, the rotational resistance on the crank handle 32 will also slowly decrease, so that a person rotating the crank handle 32 will not suddenly fall "into space” with the crank handle.
  • the hand crank only works if the bush 66 cannot rotate about the longitudinal axis 38 when starting an engine.
  • the rotationally fixed mounting of this bush 36 can be ensured, for example, by the operator supporting one foot on the lower leg 88 of the L-shaped cantilever 84 when starting an engine.
  • the right turn end 56 of the coil spring 54 does not necessarily have to be attached to the pipe section 36. Unless it's loose ends, the force to be transmitted depends on the clamping force that can be absorbed by the coil spring. This clamping force is dependent on the coefficient of friction between the spring and the tube piece 36 and on the number of turns in the area of the tube piece 36. In order to provide a positive connection with certainty, the right end 56 of the coil spring 54 will generally be fixedly attached to the pipe section 36.
  • the end region of the coil spring is not in direct contact with an abutment. Rather, a toothed disk 94 is attached to the corresponding end region of the helical spring, the axis of which coincides with the axis 38 of the second section 40 and is rotatably mounted on this second section 40.
  • a bushing 66.1 which largely corresponds to the bushing 66, there is an end plate 95 to which a pin 96 is fastened.
  • This pin 96 tightly wraps around the left end 97 of a spring rod 98, while its right end 99 is in engagement with the teeth 100 of the toothed disk 94 in such a way that the toothed disk 94 can be rotated in the direction of rotation 90 and not in the direction of rotation 92.
  • this hand crank also only works if the bush 66.1 cannot rotate about the longitudinal axis 38 when starting an engine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
EP90101357A 1989-01-25 1990-01-24 Handkurbelelement und Widerlager für dasselbe Withdrawn EP0380069A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8900807U 1989-01-25
DE8900807U DE8900807U1 (el) 1989-01-25 1989-01-25

Publications (1)

Publication Number Publication Date
EP0380069A1 true EP0380069A1 (de) 1990-08-01

Family

ID=6835379

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90101357A Withdrawn EP0380069A1 (de) 1989-01-25 1990-01-24 Handkurbelelement und Widerlager für dasselbe

Country Status (2)

Country Link
EP (1) EP0380069A1 (el)
DE (1) DE8900807U1 (el)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100365270C (zh) * 2004-11-18 2008-01-30 牛刚学 内燃机手柄起动无反转装置
CN101225786B (zh) * 2007-10-08 2012-02-29 牛刚学 柴油机手柄起动装置
CN102140986B (zh) * 2010-02-02 2013-02-20 吕振铁 脱开式可调安全手柄

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR321998A (fr) * 1902-05-31 1903-01-24 Edge Selwyn Francis Perfectionnements dans les machines à combustion interne
FR344088A (fr) * 1904-06-17 1904-10-24 Hector Gerard Manivelle de sureté pour moteurs à explosion
US1376007A (en) * 1920-09-08 1921-04-26 Dalton John Thomas Clutch for the engagement and disengagement of shafts

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR321998A (fr) * 1902-05-31 1903-01-24 Edge Selwyn Francis Perfectionnements dans les machines à combustion interne
FR344088A (fr) * 1904-06-17 1904-10-24 Hector Gerard Manivelle de sureté pour moteurs à explosion
US1376007A (en) * 1920-09-08 1921-04-26 Dalton John Thomas Clutch for the engagement and disengagement of shafts

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100365270C (zh) * 2004-11-18 2008-01-30 牛刚学 内燃机手柄起动无反转装置
CN101225786B (zh) * 2007-10-08 2012-02-29 牛刚学 柴油机手柄起动装置
CN102140986B (zh) * 2010-02-02 2013-02-20 吕振铁 脱开式可调安全手柄

Also Published As

Publication number Publication date
DE8900807U1 (el) 1989-04-27

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